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PRELIMINARY TECHNICAL DATA SHEET
SPECIFICATIONS
FREQUENCY
RESPONSE
Plus or minus 3 dB
HD-525: 55 Hz to 21 kHz
HD-650 : 45 Hz to 21 kHz
HD-800 : 35 Hz to 21 kHz
RECOMMENDED
AMPLIFIER POWER
HD-525: 10 to 100 watts
HD-650: 10 to 125 watts
HD-800: 10 to 150 watts
SENSITIVITY
88 dB 2.83V @ 1 meter.
IMPEDANCE
6 ohm nominal
HEIGHT X WIDTH
(With frame)
HD-525: 9 7/8” x 7 1/8”
HD-650: 11 11/16”x 8 3/4”
HD-800: 10 3/16” x 14 1/4”
HOLE CUTOUT
HD-525: 6 1/4” x 9”
HD-650: 7 5/8” x 10 5/8”
HD-800: 9 1/8” x 13 1/8”
DEPTH BEHIND WALL
(Assumes 1/2” drywall)
HD-525: 2 1/2”
HD-650: 2 15/16”
HD-800: 3 1/8”
INTRODUCTION
The HD High Definition group
offers loudspeakers designed for
superior sonic quality and dura-
bility. They employ advanced
technology components designed
to extract all of the subtle
nuances in recorded music or the
thunderous action in a movie.
They are perfect anywhere that
quality of sound is the most
important consideration.
CONTINUED OTHER SIDE
Mica-Filled Polypropylene
Woofers
The mica-filled polypropylene
cone achieves new standards in
transient speed and dynamic
range because of its phenomenal
rigidity and improved stiffness to
mass ratio. The inverted butyl
surrounds, the BumpBack
TM
mag-
nets and the rigid steel basket
are all optimized for large excur-
sions of the cone. In this way,
each of the HD speakers deliver
exceptionally deep and detailed
bass at realistic sound pressure
levels, without the mechanical-
ly induced limiting and distortion
of typical designs.
ElastoDynamic
TM
Hybrid
Dome Tweeter
Constructed from a composite
matrix of elastomers and natural
fiber substrates, the Elasto-
Dynamic
TM
tweeter offers extend-
ed high frequency response with-
out any harsh ringing or over-
shoot. Additionally, the elas-
tomers offer the added benefit of
weather resistance, making it
uniquely suitable for use out-
doors or in moist environments.
Acoustic Fine Tuning
An installer set “NORMAL/PRES-
ENCE” control located behind
the speaker baffle allows the
speaker to be tuned to your par-
ticular room acoustics. You can
adapt the sound for a room with
lots of furniture, heavy drapes
and wall to wall carpeting.
FEATURES AND BENEFITS
HD
525
HIGHDEFINITION
HD
650
HIGHDEFINITION
HD
800
HIGHDEFINITION
NILES
B LENDING H IGH F IDELITY
AND A RCHITECTURE
®
HD-525
• 5 1/4” Mica-Filled Polypropylene
Woofer with Inverted Butyl Rubber
Suspension
• 1” ElastoDynamic
TM
Wide
Dispersion Tweeter
• Complete System consists of:
HD-525 Speaker; 525 Bracket Kit
and 525 Frame/Grille Kit
HD-650
• 6 1/2” Mica-Filled Polypropylene
Woofer with Inverted Butyl Rubber
Suspension
• 1” ElastoDynamic
TM
Wide
Dispersion Tweeter
• Complete System consists of:
HD-650 Speaker; 650 Bracket Kit
and 650 Frame/Grille Kit
HD-800
• 8” Mica-Filled Polypropylene
Woofer with Inverted Butyl Rubber
Suspension
• 1” ElastoDynamic
TM
Wide
Dispersion Tweeter
• Complete System consists of:
HD-800 Speaker; 800 Bracket Kit
and 800 Frame/Grille Kit
HD HIGH DEFINITION — Designed for superior sonic quality and durability.
INTRODUCTION
FEATURES AND BENEFITS
®